Le prime due giocatrici della classifica mondiale hanno staccato il biglietto per i quarti di finale del WTA 1000 di Miami. L'australiana Ashleigh Barty (1) ha impiegato quasi due ore per piegare la resistenza della bielorussa Victoria Azarenka (WTA 15), imponendosi infine con il punteggio di 6-1 1-6 6-2, mentre la giapponese Naomi Osaka (2) ha sconfitto con un più agevole doppio 6-3 la belga Elise Mertens (17).
Proseguono il loro cammino anche i due top ten del ranking maschile Andrey Rublev (8) e Diego Schwartzman (9). Ai 1/16 il russo si è sbarazzato in appena 54' dell'ungherese Marton Fucsovics (40) per 6-2 6-1, l'argentino ha avuto la meglio in 1h17' su francese Adrian Mannarino (36) per 6-1 6-4. Out invece a sorpresa il canadese Denis Shapovalov (11), estromesso dal polacco Hubert Hurkacz (37) con lo score di 6-3 7-6 (8/6).
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